Pulley



(No Model.)

M. VANDEROOOK. W. P. SMITH & H. M. BAKER.

PULLEY.

No. 328,732. Patented Oct. 20, 1885.

'IIIIIIi/IIIIAVII WITNESSES:

INVENTORSI Attorney.

UNITED STATES MARK VANDERCOOK,

PATENT OFFICE.

VARD P. SMITH, AND HENRY M. BAKER, OF

MANTON, MICHIGAN.

PULLEY.

SPECIFICATION forming part of Letters Patent No. 328,732,dated October 20, 1885. Application filed May 20, 1885. Serial No. 166,085. (No model.)

To all whom it may concern.-

Be it known that we, MARK VANDERCOOK, WARD P. SMITH, and HENRY M. BAKER, citizens of the United States,residing at Manton, in the county of W'eXford and State of Michigan, have invented certain new and useful Improvements in Pulleys, of which the following is a specification.

Our invention relates to an improved pulley such as are employed in connection with ropes, cables, bands, or chains to transmit power. The object of our invention is to provide such pulleys with one or more grippers, and to so construct them and apply them to the rim of the pulley that as the pulley turns and the gripper approaches the side whereat the rope binds on the pulley-rim the gripper will be actuated by the rope.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a side view of a pulley with our improved gripper, and showing the rope or band. Fig. 2 is a top view of the same. Fig. 3 is a face view of the pulley. Fig. 4 is a diametrical section of the pulley showing the grippers applied to it.

The letter A designates the pulley, b the shaft on which it is mounted, and c the rope by which power is transmitted to or from the pulley.

Our pulley may be used with ropes, cables, round or square bands, or chains.

Arms d are rigidly attached to the side of the pulley at or near the rim, and project laterally therefrom. Two arms are necessary for one gripper-one arm at each side of the pulley. Two levers, e, have their ends jointed together at f, directly over the face of the pulley, and near this joint each lever has a jaw, e, and the two jaws confront each other and constitute the gripper. Each lever has its outmost end, 9, jointed to one of the arms d. The hole in the end of the levers through which the pivot 9 passes is slightly elongated to allow the united ends where the jaws are to be depressed. When depressed,the seat hbetween the jaws should not project beyond the face of the pulley-rim. A set-screw, i, is seated or countersunk in the pulley-rim and receives the united ends f of the two griplevers when the latter are depressed, and limits their depression. By adjusting this setscrew the extent of the depression of the griplevers is regulated, and thereby can be obtained the exact grip of the jaws e on the rope which may be desired.

A spiral or other spring, k, is recessed in the pulley-rim. A spiral spring is preferred because it may surround the set-screw i, or, in other words, the set-screw may occupy the center of thespiral spring. The jointed ends or the seat part h of the grip-levers rest upon this spring, which by bearing or pressing up against them keep them normally raised or forced out beyond the face of the pulley-rim. By means of this device the grip which the jaws have on the rope or band, when the grip levers are depressed by the binding action of the said rope or band, is released as soon as the rope or band ceases to bear on or depress the seat part it.

Instead of a spring to effect the release of the jaws, we may use a weight so arranged as to act by gravity when the jaw is in a certain place in its revolution.

The face of the jaws e are provided with soleleather or rawhide n, and as it is this which bears on the rope or band the latter is not bruised or injured as it might be if the metal face of the jaws were to bear on it.

The operation of the gripper is as follows: Vhen the gripper on the rotating pulley is at the side opposite that whereat the rope or band binds on the pulley-rim, its jaws are open or spread, and the levers and seat part h are forced out beyond the face of the pulleyrim 5 but as soon as the gripper arrives at that side where the rope or band binds, the said rope or band will press on the seat part it and depress the grip-levers, whereby the jaws move toward each other and grip the rope. By this gripping action of the jaws the rope or band is prevented from slipping on the pulley.

In the present instance the pulley-rim is shown with a groove, 10, which is occupied by the rope or band. We prefer this groove to a plain-faced rim; but our invention is not limited to a grooved pulley, as useful results may be obtained with aplain rim.

Of course this gripper may be made of any size and used in any kind of machinery where ICO it is an object to prevent the transmitting rope or band from slipping.

Having described our invention, we claim and desire to secure by Letters Patent of the United States 1. A pulley having, in combination, arm d, rigidly attached to the rim and projecting from opposite sides, and two grip-jaws jointed together over the face of the pulley and each having its outermost end, g, jointed to one of the said arms, as set forth.

2. A pulley having, in combination, gripjaws, each pivoted at its outer end, 9, at one side of the pulley, and having a band-seat, h, over the face of the pulley, and a set-screw, t, in the face of the pulley for limiting the depression of the band-seat end of the grip spring, k, recessed in the face of the pulley to release the grip, as set forth.

In testimony whereof we aflix our signatures in presence of two witnesses.

M. VANDERCOOK. WARD P. SMITH. H. M. BAKER.

Witnesses:

G130. P. THOMAS, J ESSE WILLIAMS. 

